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                    <li><a href="https://www.sogou.com" target="main">搜狗首页</a></li>
                    <li><a href="https://www.baidu.com" target="main">百度搜索</a></li>
                    <li><a href="home.html" target="main">用户界面</a></li>
                    <li><a href="https://www.bilibili.com" target="main">哔哩哔哩</a></li>
                    <li><a href="https://www.tmall.com" target="main">天猫</a></li>
                </ul>
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        <iframe name="main" src="home.html" width="100%" height="100%" frameborder="0" scrolling=“yes” style="border: 0px dotted red;"></iframe>
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